birt barcode Figure 9-3. Objects in the server JVM in Font

Drawer Data Matrix ECC200 in Font Figure 9-3. Objects in the server JVM

Figure 9-3. Objects in the server JVM
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CHAPTER 9 A SIMPLE EXAMPLE
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The server receives an object implementing ServiceRegistrar from the service locator (such as reggie). Adding in the service locator and the client in their JVMs is shown in Figure 9-4.
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Figure 9-4. Objects in all the JVMs The unknown FileClassifier object in the client is here supplied by the service object FileClassifierImpl (via the lookup service, where it is stored in passive form). The server uses a number of Jini classes. These classes must be in the CLASSPATH of the compiler. The classes are in the Jini lib directory in the jsk-platform.jar and jsk-lib.jar files. These files need to be in the CLASSPATH for any compiler, for example: javac -classpath .../jsk-platform.jar:.../jsk-lib.jar \ complete/FileClassifierServer.java An Ant file to build this server is complete.FileClassifierServer.xml: <!-Project name must be the same as the filename which must be the same as the main.class. Builds jar files with the same name --> <project name="complete.FileClassifierServer"> <!-- Inherits properties from ../build.xml: jini.home jini.jars
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CHAPTER 9 A SIMPLE EXAMPLE
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src dist build httpd.classes localhost --> <!-- files for this project --> <!-- Source files for the server --> <property name="src.files" value=" common/MIMEType.java, common/FileClassifier.java, complete/FileClassifierImpl.java, complete/FileClassifierServer.java "/> <!-- Class files to run the server --> <property name="class.files" value=" common/MIMEType.class, common/FileClassifier.class, complete/FileClassifierImpl.class, complete/FileClassifierServer.class "/> <!-- Class files for the client to download --> <property name="class.files.dl" value=" common/MIMEType.class, common/FileClassifier.class, complete/FileClassifierImpl.class "/> <!-- Uncomment if no class files downloaded to the client --> <!-- <property name="no-dl" value="true"/> --> <!-- derived names - may be changed --> <property name="jar.file" value="${ant.project.name}.jar"/> <property name="jar.file.dl" value="${ant.project.name}-dl.jar"/> <property name="main.class" value="${ant.project.name}"/> <property name="codebase" value="http://${localhost}/classes/${jar.file.dl}"/> <!-- targets --> <target name="all" depends="compile"/> <target name="compile"> <javac destdir="${build}" srcdir="${src}" classpath="${jini.jars}" includes="${src.files}">
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CHAPTER 9 A SIMPLE EXAMPLE
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</javac> </target> <target name="dist" depends="compile" description="generate the distribution"> <jar jarfile="${dist}/${jar.file}" basedir="${build}" includes="${class.files}"/> <antcall target="dist-jar-dl"/> </target> <target name="dist-jar-dl" unless="no-dl"> <jar jarfile="${dist}/${jar.file.dl}" basedir="${build}" includes="${class.files.dl}"/> </target> <target name="build" depends="dist,compile"/> <target name="run" depends="build,deploy"> <java classname="${main.class}" fork="true" classpath="${jini.jars}:${dist}/${jar.file}"> <jvmarg value="-Djava.security.policy=${res}/policy.all"/> <jvmarg value="-Djava.rmi.server.codebase=${codebase}"/> </java> </target> <target name="deploy" depends="dist" unless="no-dl"> <copy file="${dist}/${jar.file.dl}" todir="${httpd.classes}"/> </target> </project>
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Client Implementation
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The client for this service was discussed earlier in the section The Client. The client does not need any special information about this implementation of the service and so can remain quite generic.
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What Classes Need to Be Where
In this chapter, we have defined the following classes: common.MIMEType common.FileClassifier complete.FileClassifierImpl complete.FileClassifierServer client.TestFileClassifier
CHAPTER 9 A SIMPLE EXAMPLE
Instance objects of these classes could be running on up to four different machines: The server machine for FileClassifier. The machine for the lookup service. The machine running the client TestFileClassifier. An HTTP server will need to run somewhere to deliver the class file definition of FileClassifierImpl to clients. What classes need to be known to which machines The term known can refer to different things: The class may be in the CLASSPATH of a JVM. The class may be loadable across the network. The class may be accessible by an HTTP server.
Service Provider
The server running FileClassifierServer needs to know the following classes and interfaces: The common.FileClassifier interface The common.MIMEType class The complete.FileClassifierServer class The complete.FileClassifierImpl class These classes all need to be in the CLASSPATH of the server.
HTTP Server
The complete.FileClassifierImpl class will need to be accessible to an HTTP server, as discussed in the next section.
Lookup Service
The lookup service does not need to know any of these classes. It just deals with them in the form of a java.rmi.MarshalledObject.
Client
The client needs to know the following: The common.FileClassifier interface The common.MIMEType class The client.TestFileClassifier class
CHAPTER 9 A SIMPLE EXAMPLE
These all need to be in the CLASSPATH of the client. In addition, the client will need to know the class files for complete.FileClassifierImpl. However, these will come across the network as part of the discovery process, and this will be invisible to the client s programmer.
Running the FileClassifier
We now have a FileClassifierServer service and a TestFleClassifier client to run. There should also be at least one lookup locator already running. The CLASSPATH should be set for each to include the classes discussed in the last section, in addition to the standard ones. A serialized instance of complete.FileClassifierImpl will be passed from the server to the locator and then to the client. Once on the client, it will need to be able to run the class file for this service object, and so will need to load its class file from an HTTP server. The location of this class file relative to the server s DocumentRoot will need to be specified by the service invocation. For example, if it is stored in /DocumentRoot/classes/complete/FileClassifierImpl.class, then the server will also be downloading a registrar object from the lookup service, so it will need a security policy. The service will be started as follows: java -Djava.rmi.server.codebase=http://hostname/classes \ -Djava.security.policy=policy.all \ complete.FileClassifierServer In this command, hostname is the name of the host the server is running on. Note that this hostname cannot be localhost, because the localhost for the server will not be the localhost for the client! In this case, we only need to put one file, FileClassifierImpl.class, on the HTTP server. Although the implementation relies on the MIMEType and the FileClassifier interface, the client has copies of these. In more complex situations, the implementation may consist of more classes, some of which will not be known to the client. All of these class files may be put individually on the HTTP server, but it has become common practice to put them all into a .jar file with a name including -dl (for download), such as FileClassifierImpl-dl.jar. I should also point out that service browsers will not know about the classes used by the implementation, so for them to be able to examine the service, the .jar file should include all classes that the service depends on that is, the .jar file should be created as follows: jar cf FileClassifierImpl-dl.jar \ common/MIMEType.class \ common/FileClassifier.class \ complete/FileClassifierImpl.class and the server would then be run as follows: java -Djava.rmi.server.codebase=http://hostname/classes/FileClassifierImpl-dl.jar \ -Djava.security.policy=policy.all \ complete.FileClassifierServer The client will be loading a class definition across the network. It will need to allow this in a security policy file with the following statement: java -Djava.security.policy=policy.all client.TestFileClassifier
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